<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.box{
				width: 100px;
				height: 100px;
				background: #aaa;
				
				
				/* 感觉元素胖了一些 */
				/* padding: 20px; */
			}
			
			

		</style>
	</head>
	<body>
		

		<div class="box">
			
		</div>
		
		
	</body>
</html>
